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IOP Publishing, Journal of Statistical Mechanics: Theory and Experiment, 08(2006), p. P08006-P08006, 2006
DOI: 10.1088/1742-5468/2006/08/p08006
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Exact solution of the open XXZ chain with general integrable boundary terms at roots of unity
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Abstract
We propose a Bethe-Ansatz-type solution of the open spin-1/2 integrable XXZ quantum spin chain with general integrable boundary terms and bulk anisotropy values i π/(p+1), where p is a positive integer. All six boundary parameters are arbitrary, and need not satisfy any constraint. The solution is in terms of generalized T - Q equations, having more than one Q function. We find numerical evidence that this solution gives the complete set of 2^N transfer matrix eigenvalues, where N is the number of spins. ; Comment: 22 pages